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Old Dec 5, 2004 | 08:02 PM
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I'm due for a spark plug change in my 2003 2500 HD. What kind of plugs should I use and what should I gap them at?

Thanks in advance!!!!!!!
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Old Dec 5, 2004 | 08:59 PM
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stock motor, stock plugs
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Old Dec 5, 2004 | 09:12 PM
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delco iridiums and dont gap them cuz you ruin them if you do, theyre pre gapped.
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Old Dec 5, 2004 | 09:27 PM
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NGK TR5's. Leave them at preset gap. It's the same plug as stock (*heat range) but a little better plug I think.
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Old Dec 5, 2004 | 09:37 PM
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how about a stock 8100
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Old Dec 6, 2004 | 06:19 AM
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NGK TR5's
is what i would say too i have hear nothing but good stuff about them
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Old Dec 6, 2004 | 07:15 AM
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NGK TR5's like said above Stock and Iradiums have alot of problems.
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Old Dec 6, 2004 | 07:17 AM
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Originally Posted by Slowhawk
NGK TR5's like said above Stock and Iradiums have alot of problems.

Thanks Don. What gap should I set the TR55's at?
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Old Dec 6, 2004 | 10:41 AM
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Originally Posted by Slowhawk
NGK TR5's like said above Stock and Iradiums have alot of problems.
WHAT PROBLEMS DO THE IRIDUMS HAVE, I PUT THOSE IN MY TRUCK, AND HAVE HAD NO PROBLEMS,
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Old Dec 6, 2004 | 10:49 AM
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5's not 55's. The 55's are one heat range colder than stock. The 5's will have the right gap out of the box. If you just want to gap them though I think 50 or 55 thousandths would be a good.
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